塔里木盆地雅克拉地区亚格列木组高分辨率层序地层特征

High Resolution Sequence Stratigraphic characteristics Of Yageliemu Formation in Yakela,Tarim Basin

应用岩芯、测井资料,对塔里木盆地雅克拉地区亚格列木组进行层序分析,共划分出一个长期旋回,三个中期旋回以及十几个短期旋回。其中,本区发育的短期旋回类型分别为向上"变深"的非对称型(A型)和向上"变深"复"变浅"的对称型(C型)。讨论了各类短期旋回的结构类型,叠加类型和沉积组合序列。在识别湖泛面和短期旋回叠加的基础上,分析了中期旋回类型及其特征,并以中期旋回为等时单元,建立了高分辨率等时地层格架,以此讨论了在旋回控制下,有利储集体在纵向和横向上的发育规律。

Stratigraphic sequences of Yageliemu formation in Yakela region were analyzed according to data including drilling core and well--logging, then distinguished one long--term base level cycle, three middle--term base level cycles and more than ten short--term base level cycles. Two types of short--term base level cycles are developed in this region of interest, type of ＂deepening＂ upward （mode A） and type of ＂deepening＂ upward first and then ＂shoaling＂ （mode C）. Structural types, superimposition mode and sedi- mentary configuration succession of each mode of short--term base--level cycles are discussed. Guided by identification of lake flooding surface and superimposition of short--term cycles, the modes and character- istics of middle--term base--level cycles are analyzed, and then high revolution isochronous stratigraphic framework was established, with middle--term cycles to be isochronous units. At last, the horizontal and vertical developmental regular pattern of favorable reservoirs, which is by the control of base--level cycle was discussed.